David Daney 3b802c9455 Revert "hwrng: core - zeroize buffers with random data" ... This reverts commit 2cc7515458. With this commit in place I get on a Cavium ThunderX (arm64) system: $ if=/dev/hwrng bs=256 count=1 | od -t x1 -A x -v > rng-bad.txt 1+0 records in 1+0 records out 256 bytes (256 B) copied, 9.1171e-05 s, 2.8 MB/s $ dd if=/dev/hwrng bs=256 count=1 | od -t x1 -A x -v >> rng-bad.txt 1+0 records in 1+0 records out 256 bytes (256 B) copied, 9.6141e-05 s, 2.7 MB/s $ cat rng-bad.txt 000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000050 00 00 00 00 37 20 46 ae d0 fc 1c 55 25 6e b0 b8 000060 7c 7e d7 d4 00 0f 6f b2 91 1e 30 a8 fa 3e 52 0e 000070 06 2d 53 30 be a1 20 0f aa 56 6e 0e 44 6e f4 35 000080 b7 6a fe d2 52 70 7e 58 56 02 41 ea d1 9c 6a 6a 000090 d1 bd d8 4c da 35 45 ef 89 55 fc 59 d5 cd 57 ba 0000a0 4e 3e 02 1c 12 76 43 37 23 e1 9f 7a 9f 9e 99 24 0000b0 47 b2 de e3 79 85 f6 55 7e ad 76 13 4f a0 b5 41 0000c0 c6 92 42 01 d9 12 de 8f b4 7b 6e ae d7 24 fc 65 0000d0 4d af 0a aa 36 d9 17 8d 0e 8b 7a 3b b6 5f 96 47 0000e0 46 f7 d8 ce 0b e8 3e c6 13 a6 2c b6 d6 cc 17 26 0000f0 e3 c3 17 8e 9e 45 56 1e 41 ef 29 1a a8 65 c8 3a 000100 000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000050 00 00 00 00 f4 90 65 aa 8b f2 5e 31 01 53 b4 d4 000060 06 c0 23 a2 99 3d 01 e4 b0 c1 b1 55 0f 80 63 cf 000070 33 24 d8 3a 1d 5e cd 2c ba c0 d0 18 6f bc 97 46 000080 1e 19 51 b1 90 15 af 80 5e d1 08 0d eb b0 6c ab 000090 6a b4 fe 62 37 c5 e1 ee 93 c3 58 78 91 2a d5 23 0000a0 63 50 eb 1f 3b 84 35 18 cf b2 a4 b8 46 69 9e cf 0000b0 0c 95 af 03 51 45 a8 42 f1 64 c9 55 fc 69 76 63 0000c0 98 9d 82 fa 76 85 24 da 80 07 29 fe 4e 76 0c 61 0000d0 ff 23 94 4f c8 5c ce 0b 50 e8 31 bc 9d ce f4 ca 0000e0 be ca 28 da e6 fa cc 64 1c ec a8 41 db fe 42 bd 0000f0 a0 e2 4b 32 b4 52 ba 03 70 8e c1 8e d0 50 3a c6 000100 To my untrained mental entropy detector, the first several bytes of each read from /dev/hwrng seem to not be very random (i.e. all zero). When I revert the patch (apply this patch), I get back to what we have in v4.9, which looks like (much more random appearing): $ dd if=/dev/hwrng bs=256 count=1 | od -t x1 -A x -v > rng-good.txt 1+0 records in 1+0 records out 256 bytes (256 B) copied, 0.000252233 s, 1.0 MB/s $ dd if=/dev/hwrng bs=256 count=1 | od -t x1 -A x -v >> rng-good.txt 1+0 records in 1+0 records out 256 bytes (256 B) copied, 0.000113571 s, 2.3 MB/s $ cat rng-good.txt 000000 75 d1 2d 19 68 1f d2 26 a1 49 22 61 66 e8 09 e5 000010 e0 4e 10 d0 1a 2c 45 5d 59 04 79 8e e2 b7 2c 2e 000020 e8 ad da 34 d5 56 51 3d 58 29 c7 7a 8e ed 22 67 000030 f9 25 b9 fb c6 b7 9c 35 1f 84 21 35 c1 1d 48 34 000040 45 7c f6 f1 57 63 1a 88 38 e8 81 f0 a9 63 ad 0e 000050 be 5d 3e 74 2e 4e cb 36 c2 01 a8 14 e1 38 e1 bb 000060 23 79 09 56 77 19 ff 98 e8 44 f3 27 eb 6e 0a cb 000070 c9 36 e3 2a 96 13 07 a0 90 3f 3b bd 1d 04 1d 67 000080 be 33 14 f8 02 c2 a4 02 ab 8b 5b 74 86 17 f0 5e 000090 a1 d7 aa ef a6 21 7b 93 d1 85 86 eb 4e 8c d0 4c 0000a0 56 ac e4 45 27 44 84 9f 71 db 36 b9 f7 47 d7 b3 0000b0 f2 9c 62 41 a3 46 2b 5b e3 80 63 a4 35 b5 3c f4 0000c0 bc 1e 3a ad e4 59 4a 98 6c e8 8d ff 1b 16 f8 52 0000d0 05 5c 2f 52 2a 0f 45 5b 51 fb 93 97 a4 49 4f 06 0000e0 f3 a0 d1 1e ba 3d ed a7 60 8f bb 84 2c 21 94 2d 0000f0 b3 66 a6 61 1e 58 30 24 85 f8 c8 18 c3 77 00 22 000100 000000 73 ca cc a1 d9 bb 21 8d c3 5c f3 ab 43 6d a7 a4 000010 4a fd c5 f4 9c ba 4a 0f b1 2e 19 15 4e 84 26 e0 000020 67 c9 f2 52 4d 65 1f 81 b7 8b 6d 2b 56 7b 99 75 000030 2e cd d0 db 08 0c 4b df f3 83 c6 83 00 2e 2b b8 000040 0f af 61 1d f2 02 35 74 b5 a4 6f 28 f3 a1 09 12 000050 f2 53 b5 d2 da 45 01 e5 12 d6 46 f8 0b db ed 51 000060 7b f4 0d 54 e0 63 ea 22 e2 1d d0 d6 d0 e7 7e e0 000070 93 91 fb 87 95 43 41 28 de 3d 8b a3 a8 8f c4 9e 000080 30 95 12 7a b2 27 28 ff 37 04 2e 09 7c dd 7c 12 000090 e1 50 60 fb 6d 5f a8 65 14 40 89 e3 4c d2 87 8f 0000a0 34 76 7e 66 7a 8e 6b a3 fc cf 38 52 2e f9 26 f0 0000b0 98 63 15 06 34 99 b2 88 4f aa d8 14 88 71 f1 81 0000c0 be 51 11 2b f4 7e a0 1e 12 b2 44 2e f6 8d 84 ea 0000d0 63 82 2b 66 b3 9a fd 08 73 5a c2 cc ab 5a af b1 0000e0 88 e3 a6 80 4b fc db ed 71 e0 ae c0 0a a4 8c 35 0000f0 eb 89 f9 8a 4b 52 59 6f 09 7c 01 3f 56 e7 c7 bf 000100 Signed-off-by: David Daney <david.daney@cavium.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2017-02-08 18:06:03 -08:00
..
amd-rng.c	hwrng: amd - Fix return value check in mod_init()	2016-09-22 18:27:48 +08:00
atmel-rng.c	hwrng: atmel - use clk_disable_unprepare instead of clk_disable	2016-11-17 23:34:57 +08:00
bcm63xx-rng.c	hwrng: bcm63xx - fix device tree compilation	2016-04-05 20:23:11 +08:00
bcm2835-rng.c	hwrng: bcm2835 - handle of_iomap failures	2016-09-07 21:08:24 +08:00
cavium-rng-vf.c	hwrng: cavium - Add Cavium HWRNG driver for ThunderX SoC.	2016-08-31 23:00:40 +08:00
cavium-rng.c	hwrng: cavium - Add Cavium HWRNG driver for ThunderX SoC.	2016-08-31 23:00:40 +08:00
core.c	Revert "hwrng: core - zeroize buffers with random data"	2017-02-08 18:06:03 -08:00
exynos-rng.c	hwrng: exynos - fixup IO accesors	2016-06-13 17:47:50 +08:00
geode-rng.c	hwrng: geode - fix return value check in mod_init()	2016-09-22 18:27:49 +08:00
hisi-rng.c	hwrng: hisi - Add support for Hisilicon SoC RNG	2016-04-15 22:36:36 +08:00
intel-rng.c	hwrng: printk replacement	2014-10-02 14:35:00 +08:00
iproc-rng200.c	hwrng: iproc-rng200 - make use of devm_hwrng_register	2015-03-16 21:45:56 +11:00
ixp4xx-rng.c	IXP4xx: HW pseudo-random generator is available on IXP45x/46x only.	2012-11-22 03:35:39 +00:00
Kconfig	hwrng: omap - Add device variant for SafeXcel IP-76 found in Armada 8K	2016-10-21 10:27:52 +08:00
Makefile	hwrng: cavium - Add Cavium HWRNG driver for ThunderX SoC.	2016-08-31 23:00:40 +08:00
meson-rng.c	hwrng: meson - Remove unneeded platform MODULE_ALIAS	2016-10-25 11:08:25 +08:00
msm-rng.c	hwrng: Make explicit that max >= 32 always	2016-11-21 22:50:45 +08:00
mxc-rnga.c	hwrng: mxc-rnga - Use the preferred format for kzalloc	2015-09-21 22:00:39 +08:00
n2-asm.S
n2-drv.c	hwrng: n2 - Attach on T5/M5, T7/M7 SPARC CPUs	2016-01-26 22:35:30 +08:00
n2rng.h
nomadik-rng.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2014-04-03 09:28:16 -07:00
octeon-rng.c	hwrng: octeon - Use devm_hwrng_register	2015-09-21 22:00:38 +08:00
omap3-rom-rng.c	hwrng: omap3-rom - Remove obsoleted functions	2016-08-24 21:04:50 +08:00
omap-rng.c	hwrng: omap - Add device variant for SafeXcel IP-76 found in Armada 8K	2016-10-21 10:27:52 +08:00
pasemi-rng.c	hwrng: pasemi - Use linux/io.h instead of asm/io.h	2016-09-13 20:27:21 +08:00
pic32-rng.c	hwrng: Make explicit that max >= 32 always	2016-11-21 22:50:45 +08:00
powernv-rng.c	char: constify of_device_id array	2015-03-16 21:10:28 +01:00
pseries-rng.c	hwrng: Make explicit that max >= 32 always	2016-11-21 22:50:45 +08:00
st-rng.c	hwrng: st - Fix missing clk_disable_unprepare() on error in st_rng_probe()	2016-09-13 20:27:24 +08:00
stm32-rng.c	hwrng: stm32 - fix maybe uninitialized variable warning	2016-05-31 16:41:57 +08:00
timeriomem-rng.c	char: hw_random: drop owner assignment from platform_drivers	2014-10-20 16:20:20 +02:00
tpm-rng.c	hw_random: add support for the TPM chip as a hardware RNG source	2012-08-22 11:11:41 -05:00
tx4939-rng.c	hwrng: tx4939 - Use devm_hwrng_register instead of hwrng_register	2016-08-31 23:00:49 +08:00
via-rng.c	x86/fpu: Remove irq_ts_save() and irq_ts_restore()	2016-11-01 07:47:54 +01:00
virtio-rng.c	hwrng: virtio - drop extra empty line	2015-01-26 11:34:23 +11:00
xgene-rng.c	hwrng: xgene - fix handling platform_get_irq	2015-09-21 22:57:37 +08:00